JPH11295243A - X-ray ct scanner apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exert a high resolution quickly in a compact constitution by setting a plurality of pairs of detecting apparatuses each comprising an X-ray generator and an X-ray detector via a space to a flow of a body to be detected, and carrying out detection. SOLUTION: A parcel 3' running on a conveyor is placed on a conveyor rotational guide 21 of a parcel-rotating device 8 within a shield box. An X-ray detection apparatus is constituted of an X-ray generator and an X-ray detector in pairs. X-ray generators 31, 32, 33, 34 and X-ray detectors 35, 36, 37, 38 are fixed to a fixing guide 41. Each detection apparatus is arranged on the same plane to the parcel 3'. A fan beam angle is set to be 24 deg.. The detection is carried out for every 1 deg. of a parcel rotational angle 51 deg., whereby 51 projection data are obtained by one detection apparatus. A total of 51×4=204 projection data are obtained by the four detection apparatuses. A clear pickup image is achieved when the projection data of 40 or more are collected. The 51 deg. rotation can obtain the same data as a 204 deg. rotation, reducing a scan time to 1/4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an X-ray CT scanner apparatus and method, and more particularly to an apparatus and method for X-ray CT scanner (X-ray computer tomography scanner) inside a package.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
More particularly, the present invention relates to an X-ray CT scanner having a plurality of X-ray sources and X-ray detector pairs and enabling a high-speed scanner.
A scanner device is described. Specifically, in this publication, an X-ray source and a multi-channel X-ray detector are arranged to face each other via an imaging region, and a subject placed in the imaging region is exposed from the X-ray source. In the X-ray CT scanner device, the transmitted X-rays emitted and transmitted from multiple directions are detected by the X-ray detector and subjected to reconstruction processing.
An X-ray CT scanner device having a plurality of pairs of a radiation source and the X-ray detector and arranging these pairs asymmetrically with respect to the center of rotation is described.

In Japanese Patent Application Laid-Open No. 60-73443, a transport path for transporting a subject is provided, and a narrow predetermined divergence angle along a predetermined plane is set so as to be opposed via the transport path. A radiation source that radiates fan beam radiation having a multi-channel detector having a two-dimensional resolution for detecting the fan beam radiation, and a gantry that traverse scans holding the radiation source and the detector. The plurality of units each have a different radiation projection direction angle of the radiation source with respect to the subject, and are arranged side by side on a transport path with a predetermined interval therebetween. The gantry is traversed and scanned to collect radiation transmission data of the cross section of the subject at the time of rest, and when the subject passes through each gantry, the transmission data of the cross section of the subject is projected by radiation from each direction. To obtain data, the radiation tomography apparatus of this was to use in image reconstruction is described.

[0004]

In the prior art, it has been proposed to provide a plurality of pairs of an X-ray source and an X-ray detector to speed up the scanning and achieve a high resolution. .

[0005] In modern logistics systems, a very large number of packages are handled. These packages do not necessarily contain dangerous goods. Confirming the safety of parcels that flow from moment to moment in a very short time is a very important concern for those who are involved in logistics systems. According to the prior art, scanning of such a large number of subjects is not satisfactory in its high speed and resolution.

In view of the above, the present invention provides an X-ray CT scanner apparatus and method capable of performing X-ray CT scanning with a high speed and a high resolution while being compact for a large number of subjects such as packages. The purpose is to do.

Further, the present invention provides an X-ray CT scanner and a method capable of reliably and inexpensively identifying a built-in package in consideration of the fact that a large number of packages are handled in many places in Japan. is there.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of pairs of detecting means obtain projection data at a certain rotation angle while rotating a subject such as a parcel by a predetermined angle. The same data as the rotation is obtained at a predetermined angle of rotation, and furthermore, the projection data obtained in this way can be extremely large, so that high resolution can be obtained.

The present invention specifically provides the following apparatus and method.

According to the present invention, an X-ray generator and an X-ray detector are arranged to face each other, and a transmitted X-ray emitted from the X-ray generator and transmitted through the subject is detected by the X-ray detector. In an X-ray CT scanner device for processing a detection signal to form a tomographic image of a subject, a subject rotating device for rotating the subject by a predetermined angle is provided, and a plurality of pairs of the X-ray generator and the detector are provided. A projection data forming device that is arranged on the same plane with respect to a subject and at a predetermined angle and forms projection data based on transmitted X-rays detected by each detector, and an imaging device that processes the formed projection data An X-ray CT scanner provided with an image processing device is provided.

According to the present invention, an X-ray generator and an X-ray detector are arranged opposite to each other, and a transmitted X-ray emitted from the X-ray generator and transmitted through the subject is detected by the X-ray detector. In an X-ray CT scanner device that processes a detection signal to form a tomographic image of a subject, a subject rotating device that rotates the subject by a predetermined angle is provided, and a plurality of pairs of the X-ray generator and the detector are provided. A plurality of pair detectors are provided on the same surface with respect to the subject and arranged at a predetermined angle, and the plurality of pair detectors are provided at intervals with respect to the flow of the subject. Provided is an X-ray CT scanner device provided with a captured image processing device for forming projection data based on transmitted X-rays detected by each detector.

According to the present invention, an X-ray generator and an X-ray detector are arranged opposite to each other, and a transmitted X-ray emitted from the X-ray generator and transmitted through the subject is detected by the X-ray detector. In an X-ray CT scanner device that processes a detection signal to form a tomographic image of a subject, a subject rotating device that rotates the subject by a predetermined angle is provided, and a plurality of pairs of the X-ray generator and the detector are provided. An omnidirectional projection data constructing device arranged at a predetermined angle and configured to form projection data based on transmitted X-rays from different directions corresponding to the number of the detectors when the subject is rotated, X-ray C provided with a captured image processing device that collectively processes data to form a tomographic image of a subject
A T-scanner device is provided.

Preferably, the plurality of pairs are 2 to 4
Is any pair of

According to the present invention, a transmitted X-ray emitted from an X-ray generator and transmitted through an object is detected by an X-ray detector,
X-ray C for processing a detection signal to form a tomographic image of a subject
In the T-scanner method, the subject is rotated within a range of 51 °, projection data based on X-rays transmitted in four different directions is simultaneously formed for each predetermined rotation angle of the subject, and these are processed to obtain a tomographic image of the subject. X-ray CT scanner method for forming

According to the present invention, there is provided an X-ray CT for detecting a transmitted X-ray emitted from an X-ray generator and transmitted by an X-ray generator with an X-ray detector and processing a detection signal to form a tomographic image of the subject.
In the scanner method, the subject is rotated within a predetermined angle range within 10 seconds, and simultaneously constructs projection data of 40 to 204 based on different direction transmission X-rays for each predetermined angle of the subject,
X-ray CT processing these to form a tomographic image of the subject
A scanner method is provided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of the apparatus of the present invention. In the figure, the apparatus is composed of a plurality of X-ray detectors 1 each composed of a pair of an X-ray generator and an X-ray detector, and a shielding box 2 and a parcel 3 in which the X-ray detectors are arranged. Delivering conveyor 7 for leading out introduction conveyor 5 and parcel 3 ″ after inspection from window 6 of shielding box 2, parcel rotation device 8, high-pressure generator and X-ray controller 9, X-ray projection data construction device 10, X-ray projection It comprises a captured image processing device 11 based on data and a CRT 12 for projecting the image.

FIG. 2 and FIG. 3 show details of the X-ray detector 1. In the figure, parcel 3 flowing on conveyor 5
Are arranged on the conveyor rotation guide 21 of the package rotation device 8 in the shielding box. The state is indicated by a parcel 3 '.

The parcel rotation device 8 includes a conveyor rotation guide 2
1, a rotation driving device 22, a gear tooth engagement device (not shown) for transmitting the rotation force to the conveyor rotation guide 21 by receiving the rotation force, and a roller 23.

The X-ray detector 1 comprises a pair of an X-ray generator and an X-ray detector, and four such pairs are shown in the figure. Each is represented by four sets of (a) (b) (c) (d),
The X-ray detectors are indicated at 31, 32, 33, 34 and the X-ray detectors are indicated at 35, 36, 37, 38.

The X-ray generators 31, 32, 33, 34 and the X-ray detectors 35, 36, 37, 38 are fixed to their fixing guides 40. The fixing guide 40 is the stem 4
It is fixed to the shielding box 2 via 1, 42, 43, 44, 45, 46. Therefore, each detecting device is arranged on the same plane with respect to the parcel 3 '. X of each X-ray generator
The X-ray irradiation angle (fan beam angle) is set to 24 °, and the X-ray detectors are arranged at positions where they do not interfere with each other. The shooting area is indicated by A. The parcel is rotated by 51 ° (one of the predetermined angles). If the detection operation is performed for each parcel rotation angle 51 ° every 1 °, 51 pieces of projection data can be obtained by one detecting device, and therefore, 51 × 4 = 20 in four detecting devices.
Four projection data can be obtained. When this projection data becomes 40 or more, a clear captured image can be obtained.

According to this configuration, 2 rotations by 51 °
The same data as in 04 ゜ can be obtained. That is, the scan time can be reduced to 1/4.

Next, the resolution will be described.

FIG. 4 shows the function of each X-ray detector. In the figure, X-ray generators 41, 42, 43, 4
4 and the X-ray detectors 35, 36, 37, 38 form projection data 1, 2, 3, 4 with the 51 ° rotation of the parcel 3 '.

FIG. 4 shows projection data A obtained by the X-ray generator 35A and the X-ray detector 41A when the parcel 204 is rotated by the angle 204 ° to the left.

When the composed projection data is synthesized and collected by the captured image processing apparatus 10, the same projection data as the projection data A is obtained, and this can be displayed on the CRT 11.

As described above, the same captured image as that obtained by rotating the image by 204 ° can be obtained on the CRT 11, and an extremely large number of image signals can be formed for 51 ° rotation. it can. If the detection operation is performed at every rotation of 1 °, 51 × 4 = 204 data is obtained as described above, and if the detection operation is performed at every rotation of 5 °, 4 data is obtained.
Zero data can be configured.

Therefore, an extremely high resolution can be obtained.

FIGS. 5 and 6 show a second embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and will not be described repeatedly. However, when there are two, a and b are added.

In the first embodiment, four detectors are arranged on the same plane with respect to the parcel 3 ', but in this embodiment, each of the two detectors is divided into two pairs and each is provided with two fixing guides. It is fixed to 41a, 41b.

In this embodiment, two pairs of detectors are provided on each side. Compared to the four cases, even if the X-ray detectors are brought closer to each other, no interference occurs, so that there is an effect that the entire outer shape can be reduced.

In the case of the first embodiment, the whole outer shape is large, but it is not necessary to rotate the parcel 3 'twice by 51 °, so that it is superior to the second embodiment in terms of speed and accuracy. Become.

Therefore, it is recommended to make a proper selection according to the intended use.

As shown in the first embodiment and the second embodiment, according to these embodiments, the parcel is rotated by a predetermined angle, and two or more X-ray detectors are simultaneously rotated at a predetermined angle by one rotation. Projection data is obtained at the same point by the number of X-ray detectors. Since the projection data is at the same point, an image with high accuracy and high resolution can be obtained when the captured image processing is performed using the projection data.

[0035]

According to the present invention, the X-ray detection apparatus is fixed by rotating a subject such as a parcel, and detection operations can be performed simultaneously from multiple directions during rotation. It can be configured as one or more projection data. Therefore, when the projection data obtained in this way is processed by a computer to obtain a captured image, there is an effect that the actual state of the object inside the parcel can be well grasped. Further, since the X-ray detection device can be placed on the same surface, the length of the entire device can be shortened.
It can be a T-scanner device.

[Brief description of the drawings]

FIG. 1 is an external view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a front view showing an arrangement of an X-ray detection device and the like.

FIG. 3 is a side view of the apparatus according to the embodiment.

FIG. 4 is a functional diagram showing functions of the present invention.

FIG. 5 is a front view showing an arrangement of an X-ray detection device and the like according to another embodiment of the present invention.

FIG. 6 is a side view of a device according to another embodiment.

[Explanation of symbols]

1. X-ray detector, 2. shielding box, 3, 3 ',
3 "... parcel, 8 ... parcel rotation device, 9 ... X-ray controller, 10
... X-ray projection data construction device, 11 ... captured image processing device,
21: conveyor rotation guide, 22: rotation drive device, 23
... gear tooth engagement devices, 31, 32, 33, 34 ... X-ray detectors, 35, 36, 37, 38 ... X-ray detectors, 40 ... fixing guides.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Katsutoshi Sato 3-1-1, Komachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant

Claims (6)

[Claims] An X-ray generator and an X-ray detector are arranged to face each other,
An X-ray CT scanner device for detecting a transmitted X-ray emitted from the X-ray generator and transmitted through the X-ray generator with the X-ray detector and processing a detection signal to form a tomographic image of the subject. An object rotating device for rotating the sample by a predetermined angle is provided, and a plurality of pairs of the X-ray generator and the detector are arranged on the same surface with respect to the object and at a predetermined angle. An X-ray CT scanner device comprising: a projection data forming device for forming projection data based on transmitted X-rays detected by a detector; and a captured image processing device for processing the formed projection data. 2. An X-ray generator and an X-ray detector are arranged facing each other,
An X-ray CT scanner device for detecting a transmitted X-ray emitted from the X-ray generator and transmitted through the X-ray generator with the X-ray detector and processing a detection signal to form a tomographic image of the subject. A plurality of pairs of X-ray generators and detectors are provided on the same plane with respect to the subject, and a plurality of pairs are arranged at a predetermined angle with respect to the subject. A plurality of the plurality of paired detection devices are provided at intervals with respect to the flow of the subject, and image processing for forming and processing projection data based on transmitted X-rays detected by each detector. X provided with a device
X-ray CT scanner device. 3. An X-ray generator and an X-ray detector are opposed to each other,
An X-ray CT scanner device for detecting a transmitted X-ray emitted from the X-ray generator and transmitted through the X-ray generator with the X-ray detector and processing a detection signal to form a tomographic image of the subject. A subject rotating device for rotating the sample by a predetermined angle is provided, a plurality of pairs of the X-ray generator and the detector are arranged at a predetermined angle, and the number of the detectors is increased when the sample is rotated. A different direction projection data forming device for forming projection data based on transmitted X-rays from a corresponding different direction is provided; and a picked-up image processing device for forming a tomographic image of a subject by collectively processing the different direction projection data is provided. An X-ray CT scanner device characterized by the above-mentioned. 4. The X-ray CT scanner according to claim 1, wherein the plurality of pairs are any one of pairs 2 to 4. 5. An X-ray CT scanner method for detecting, with an X-ray detector, transmitted X-rays emitted from an X-ray generator and transmitted through an X-ray generator, and processing a detection signal to form a tomographic image of the subject. In the above, the subject is rotated within a range of 51 °, projection data based on X-rays transmitted in four different directions are simultaneously formed for each predetermined rotation angle of the subject, and these are processed to form a tomographic image of the subject. An X-ray CT scanner method, comprising: 6. An X-ray CT scanner method for detecting a transmitted X-ray emitted from an X-ray generator and transmitted by an X-ray generator with an X-ray detector and processing a detection signal to form a tomographic image of the subject. The subject is rotated within a predetermined angle range within 10 seconds, and projection data of 40 to 204 are simultaneously formed based on the differently transmitted X-rays for each predetermined angle of the subject, and these are processed to obtain a tomographic image of the subject. X-ray C, which forms a shadow image
T scanner method.